Japan Inflation Calculator

Buying power of ¥100 in 1980

This chart shows a calculation of buying power equivalence for ¥100 in 1980 (price index tracking began in 1955).

For example, if you started with ¥100, you would need to end with ¥132.79 in order to "adjust" for inflation (sometimes refered to as "beating inflation").

When ¥100 is equivalent to ¥132.79 over time, that means that the "real value" of a single Japanese yen decreases over time. In other words, a yen will pay for fewer items at the store.

This effect explains how inflation erodes the value of a yen over time. By calculating the value in 1980 dollars, the chart below shows how ¥100 is worth less over 46 years.

According to the OECD and the World Bank, each of these JPY amounts below is equal in terms of what it could buy at the time:

This conversion table shows various other 1980 amounts in today's yen, based on the 32.79% change in prices:

How to calculate inflation rate for ¥100 since 1980

Our calculations use the following inflation rate formula to calculate the change in value between 1980 and today:

Then plug in historical CPI values. The Japanese CPI was 74.47188 in the year 1980 and 98.88921722067573 in 2026:

¥100 in 1980 has the same "purchasing power" or "buying power" as ¥132.79 in 2026.

To get the total inflation rate for the 46 years between 1980 and 2026, we use the following formula:

Plugging in the values to this equation, we get:

Data source & citation

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